Hideo Kojima has teased on Twitter something known as the "devil project." Let the speculation commence.
The Metal Gear Solid creator hinted at the work through several tweets.
"Have to give priority to another line’s scenario etc., so now I cannot work on 'the devil project' and 'writing'."
"Worked on my 'devil project' a bit after lunch. An experiment went well. Plot adjustment. Additional project. Phew.. now another line."
There was no other hint as to what the "devil project" actually is.
Place your bets now, ladies.